So it's not like the laptops we used to know, where you can just "pull" the battery out of the back by hand, so that any end user can replace it in two easy steps.
But of course you can unscrew the device, remove the battery and replace it with a new one. The prerequisite (apart from a bit of manual dexterity) is that you can find a suitable replacement battery somewhere to order when this question comes up. This is usually not a big problem, but cannot be guaranteed.